We changed our old honeywell thermostat (with mercury) to an updated honeywell thermostat (with no mercury) CT87K. After we changed the thermostat the furnace will not automatically kick on and it actually shut off so we had to hit the reset button.
The furnace at times now will turn of if we put the desired temperature to 70 even though the temperature in the home is 66.
What did we do wrong here? Thank you.:confused: